2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
14 select SYS_SUPPORTS_APM_EMULATION
17 select HAVE_KPROBES if (!XIP_KERNEL)
18 select HAVE_KRETPROBES if (HAVE_KPROBES)
19 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
20 select HAVE_GENERIC_DMA_COHERENT
21 select HAVE_KERNEL_GZIP
22 select HAVE_KERNEL_LZO
24 The ARM series is a line of low-power-consumption RISC chip designs
25 licensed by ARM Ltd and targeted at embedded applications and
26 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
27 manufactured, but legacy ARM-based PC hardware remains popular in
28 Europe. There is an ARM Linux project with a web page at
29 <http://www.arm.linux.org.uk/>.
34 config SYS_SUPPORTS_APM_EMULATION
43 config GENERIC_CLOCKEVENTS
46 config GENERIC_CLOCKEVENTS_BROADCAST
48 depends on GENERIC_CLOCKEVENTS
49 default y if SMP && !LOCAL_TIMERS
53 select GENERIC_ALLOCATOR
61 The Extended Industry Standard Architecture (EISA) bus was
62 developed as an open alternative to the IBM MicroChannel bus.
64 The EISA bus provided some of the features of the IBM MicroChannel
65 bus while maintaining backward compatibility with cards made for
66 the older ISA bus. The EISA bus saw limited use between 1988 and
67 1995 when it was made obsolete by the PCI bus.
69 Say Y here if you are building a kernel for an EISA-based machine.
79 MicroChannel Architecture is found in some IBM PS/2 machines and
80 laptops. It is a bus system similar to PCI or ISA. See
81 <file:Documentation/mca.txt> (and especially the web page given
82 there) before attempting to build an MCA bus kernel.
84 config GENERIC_HARDIRQS
88 config STACKTRACE_SUPPORT
92 config HAVE_LATENCYTOP_SUPPORT
97 config LOCKDEP_SUPPORT
101 config TRACE_IRQFLAGS_SUPPORT
105 config HARDIRQS_SW_RESEND
109 config GENERIC_IRQ_PROBE
113 config GENERIC_LOCKBREAK
116 depends on SMP && PREEMPT
118 config RWSEM_GENERIC_SPINLOCK
122 config RWSEM_XCHGADD_ALGORITHM
125 config ARCH_HAS_ILOG2_U32
128 config ARCH_HAS_ILOG2_U64
131 config ARCH_HAS_CPUFREQ
134 Internal node to signify that the ARCH has CPUFREQ support
135 and that the relevant menu configurations are displayed for
138 config GENERIC_HWEIGHT
142 config GENERIC_CALIBRATE_DELAY
146 config ARCH_MAY_HAVE_PC_FDC
152 config GENERIC_ISA_DMA
161 config GENERIC_HARDIRQS_NO__DO_IRQ
166 config OPROFILE_ARMV6
168 depends on CPU_V6 && !SMP
169 select OPROFILE_ARM11_CORE
171 config OPROFILE_MPCORE
173 depends on CPU_V6 && SMP
174 select OPROFILE_ARM11_CORE
176 config OPROFILE_ARM11_CORE
179 config OPROFILE_ARMV7
181 depends on CPU_V7 && !SMP
188 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
189 default DRAM_BASE if REMAP_VECTORS_TO_RAM
192 The base address of exception vectors.
194 source "init/Kconfig"
196 source "kernel/Kconfig.freezer"
201 bool "MMU-based Paged Memory Management Support"
204 Select if you want MMU-based virtualised addressing space
205 support by paged memory management. If unsure, say 'Y'.
208 prompt "ARM system type"
209 default ARCH_VERSATILE
212 bool "Agilent AAEC-2000 based"
217 This enables support for systems based on the Agilent AAEC-2000
219 config ARCH_INTEGRATOR
220 bool "ARM Ltd. Integrator family"
222 select ARCH_HAS_CPUFREQ
227 Support for ARM's Integrator platform.
230 bool "ARM Ltd. RealView family"
236 select GENERIC_CLOCKEVENTS
237 select ARCH_WANT_OPTIONAL_GPIOLIB
239 This enables support for ARM Ltd RealView boards.
241 config ARCH_VERSATILE
242 bool "ARM Ltd. Versatile family"
249 select GENERIC_CLOCKEVENTS
250 select ARCH_WANT_OPTIONAL_GPIOLIB
252 This enables support for ARM Ltd Versatile board.
257 select ARCH_REQUIRE_GPIOLIB
260 This enables support for systems based on the Atmel AT91RM9200,
261 AT91SAM9 and AT91CAP9 processors.
264 bool "Cirrus Logic CLPS711x/EP721x-based"
267 Support for Cirrus Logic 711x/721x based boards.
270 bool "Cortina Systems Gemini"
273 select ARCH_REQUIRE_GPIOLIB
275 Support for the Cortina Systems Gemini family SoCs
283 This is an evaluation board for the StrongARM processor available
284 from Digital. It has limited hardware on-board, including an
285 Ethernet interface, two PCMCIA sockets, two serial ports and a
296 select ARCH_REQUIRE_GPIOLIB
297 select ARCH_HAS_HOLES_MEMORYMODEL
299 This enables support for the Cirrus EP93xx series of CPUs.
301 config ARCH_FOOTBRIDGE
306 Support for systems based on the DC21285 companion chip
307 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
310 bool "Freescale MXC/iMX-based"
312 select GENERIC_CLOCKEVENTS
313 select ARCH_REQUIRE_GPIOLIB
317 Support for Freescale MXC/iMX-based family of processors
320 bool "Freescale STMP3xxx"
324 select ARCH_REQUIRE_GPIOLIB
326 select GENERIC_CLOCKEVENTS
328 select USB_ARCH_HAS_EHCI
330 Support for systems based on the Freescale 3xxx CPUs.
333 bool "Hilscher NetX based"
336 select GENERIC_CLOCKEVENTS
339 This enables support for systems based on the Hilscher NetX Soc
342 bool "Hynix HMS720x-based"
346 This enables support for systems based on the Hynix HMS720x
349 bool "STMicroelectronics Nomadik"
356 select GENERIC_CLOCKEVENTS
358 select ARCH_REQUIRE_GPIOLIB
360 Support for the Nomadik platform by ST-Ericsson
368 select ARCH_SUPPORTS_MSI
371 Support for Intel's IOP13XX (XScale) family of processors.
380 select ARCH_REQUIRE_GPIOLIB
382 Support for Intel's 80219 and IOP32X (XScale) family of
392 select ARCH_REQUIRE_GPIOLIB
394 Support for Intel's IOP33X (XScale) family of processors.
402 Support for Intel's IXP23xx (XScale) family of processors.
405 bool "IXP2400/2800-based"
410 Support for Intel's IXP2400/2800 (XScale) family of processors.
418 select GENERIC_CLOCKEVENTS
419 select DMABOUNCE if PCI
421 Support for Intel's IXP4XX (XScale) family of processors.
428 Say Y here if you intend to run this kernel on a LinkUp Systems
429 L7200 Software Development Board which uses an ARM720T processor.
430 Information on this board can be obtained at:
432 <http://www.linkupsys.com/>
434 If you have any questions or comments about the Linux kernel port
435 to this board, send e-mail to <sjhill@cotw.com>.
441 select ARCH_REQUIRE_GPIOLIB
443 select GENERIC_CLOCKEVENTS
446 Support for the Marvell Dove SoC 88AP510
449 bool "Marvell Kirkwood"
453 select ARCH_REQUIRE_GPIOLIB
455 select GENERIC_CLOCKEVENTS
458 Support for the following Marvell Kirkwood series SoCs:
459 88F6180, 88F6192 and 88F6281.
462 bool "Marvell Loki (88RC8480)"
465 select GENERIC_CLOCKEVENTS
468 Support for the Marvell Loki (88RC8480) SoC.
471 bool "Marvell MV78xx0"
475 select ARCH_REQUIRE_GPIOLIB
477 select GENERIC_CLOCKEVENTS
480 Support for the following Marvell MV78xx0 series SoCs:
489 select ARCH_REQUIRE_GPIOLIB
491 select GENERIC_CLOCKEVENTS
494 Support for the following Marvell Orion 5x series SoCs:
495 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
496 Orion-2 (5281), Orion-1-90 (6183).
499 bool "Marvell PXA168/910/MMP2"
502 select ARCH_REQUIRE_GPIOLIB
506 select GENERIC_CLOCKEVENTS
510 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
513 bool "Micrel/Kendin KS8695"
516 select ARCH_REQUIRE_GPIOLIB
518 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
519 System-on-Chip devices.
522 bool "NetSilicon NS9xxx"
526 select GENERIC_CLOCKEVENTS
529 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
532 <http://www.digi.com/products/microprocessors/index.jsp>
535 bool "Nuvoton W90X900 CPU"
537 select ARCH_REQUIRE_GPIOLIB
542 select GENERIC_CLOCKEVENTS
544 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
545 At present, the w90x900 has been renamed nuc900, regarding
546 the ARM series product line, you can login the following
547 link address to know more.
549 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
550 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
553 bool "Philips Nexperia PNX4008 Mobile"
557 This enables support for Philips PNX4008 mobile platform.
560 bool "PXA2xx/PXA3xx-based"
563 select ARCH_HAS_CPUFREQ
567 select ARCH_REQUIRE_GPIOLIB
569 select GENERIC_CLOCKEVENTS
573 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
579 select GENERIC_CLOCKEVENTS
581 Support for Qualcomm MSM7K based systems. This runs on the ARM11
582 apps processor of the MSM7K and depends on a shared memory
583 interface to the ARM9 modem processor which runs the baseband stack
584 and controls some vital subsystems (clock and power control, etc).
587 bool "Renesas SH-Mobile"
589 Support for Renesas's SH-Mobile ARM platforms
596 select ARCH_MAY_HAVE_PC_FDC
597 select HAVE_PATA_PLATFORM
600 select ARCH_SPARSEMEM_ENABLE
602 On the Acorn Risc-PC, Linux can support the internal IDE disk and
603 CD-ROM interface, serial and parallel port, and the floppy drive.
609 select ARCH_SPARSEMEM_ENABLE
611 select ARCH_HAS_CPUFREQ
615 select GENERIC_CLOCKEVENTS
618 select ARCH_REQUIRE_GPIOLIB
620 Support for StrongARM 11x0 based boards.
623 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
625 select ARCH_HAS_CPUFREQ
628 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
629 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
630 the Samsung SMDK2410 development board (and derivatives).
633 bool "Samsung S3C64XX"
636 select ARCH_HAS_CPUFREQ
638 Samsung S3C64XX series based systems
641 bool "Samsung S5P6440"
646 Samsung S5P6440 CPU based systems
649 bool "Samsung S5PC1XX"
654 Samsung S5PC1XX series based systems
664 Support for the StrongARM based Digital DNARD machine, also known
665 as "Shark" (<http://www.shark-linux.de/shark.html>).
670 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
671 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
673 Say Y here for systems based on one of the Sharp LH7A40X
674 System on a Chip processors. These CPUs include an ARM922T
675 core with a wide array of integrated devices for
676 hand-held and low-power applications.
679 bool "ST-Ericsson U300 Series"
686 select GENERIC_CLOCKEVENTS
691 Support for ST-Ericsson U300 series mobile platforms.
697 select GENERIC_CLOCKEVENTS
699 select ARCH_REQUIRE_GPIOLIB
704 select GENERIC_ALLOCATOR
705 select ARCH_HAS_HOLES_MEMORYMODEL
707 Support for TI's DaVinci platform.
713 select ARCH_REQUIRE_GPIOLIB
714 select ARCH_HAS_CPUFREQ
716 select GENERIC_CLOCKEVENTS
717 select ARCH_HAS_HOLES_MEMORYMODEL
719 Support for TI's OMAP platform (OMAP1 and OMAP2).
722 bool "Broadcom BCMRING"
728 select GENERIC_CLOCKEVENTS
729 select ARCH_WANT_OPTIONAL_GPIOLIB
731 Support for Broadcom's BCMRing platform.
734 bool "ST-Ericsson U8500 Series"
738 select GENERIC_CLOCKEVENTS
741 Support for ST-Ericsson's Ux500 architecture
745 source "arch/arm/mach-aaec2000/Kconfig"
747 source "arch/arm/mach-at91/Kconfig"
749 source "arch/arm/mach-bcmring/Kconfig"
751 source "arch/arm/mach-clps711x/Kconfig"
753 source "arch/arm/mach-davinci/Kconfig"
755 source "arch/arm/mach-dove/Kconfig"
757 source "arch/arm/mach-ep93xx/Kconfig"
759 source "arch/arm/mach-footbridge/Kconfig"
761 source "arch/arm/mach-gemini/Kconfig"
763 source "arch/arm/mach-h720x/Kconfig"
765 source "arch/arm/mach-integrator/Kconfig"
767 source "arch/arm/mach-iop32x/Kconfig"
769 source "arch/arm/mach-iop33x/Kconfig"
771 source "arch/arm/mach-iop13xx/Kconfig"
773 source "arch/arm/mach-ixp4xx/Kconfig"
775 source "arch/arm/mach-ixp2000/Kconfig"
777 source "arch/arm/mach-ixp23xx/Kconfig"
779 source "arch/arm/mach-kirkwood/Kconfig"
781 source "arch/arm/mach-ks8695/Kconfig"
783 source "arch/arm/mach-lh7a40x/Kconfig"
785 source "arch/arm/mach-loki/Kconfig"
787 source "arch/arm/mach-msm/Kconfig"
789 source "arch/arm/mach-mv78xx0/Kconfig"
791 source "arch/arm/plat-mxc/Kconfig"
793 source "arch/arm/mach-netx/Kconfig"
795 source "arch/arm/mach-nomadik/Kconfig"
796 source "arch/arm/plat-nomadik/Kconfig"
798 source "arch/arm/mach-ns9xxx/Kconfig"
800 source "arch/arm/plat-omap/Kconfig"
802 source "arch/arm/mach-omap1/Kconfig"
804 source "arch/arm/mach-omap2/Kconfig"
806 source "arch/arm/mach-orion5x/Kconfig"
808 source "arch/arm/mach-pxa/Kconfig"
809 source "arch/arm/plat-pxa/Kconfig"
811 source "arch/arm/mach-mmp/Kconfig"
813 source "arch/arm/mach-realview/Kconfig"
815 source "arch/arm/mach-sa1100/Kconfig"
817 source "arch/arm/plat-samsung/Kconfig"
818 source "arch/arm/plat-s3c24xx/Kconfig"
819 source "arch/arm/plat-s3c64xx/Kconfig"
820 source "arch/arm/plat-s3c/Kconfig"
821 source "arch/arm/plat-s5p/Kconfig"
822 source "arch/arm/plat-s5pc1xx/Kconfig"
825 source "arch/arm/mach-s3c2400/Kconfig"
826 source "arch/arm/mach-s3c2410/Kconfig"
827 source "arch/arm/mach-s3c2412/Kconfig"
828 source "arch/arm/mach-s3c2440/Kconfig"
829 source "arch/arm/mach-s3c2442/Kconfig"
830 source "arch/arm/mach-s3c2443/Kconfig"
834 source "arch/arm/mach-s3c6400/Kconfig"
835 source "arch/arm/mach-s3c6410/Kconfig"
838 source "arch/arm/mach-s5p6440/Kconfig"
840 source "arch/arm/mach-shmobile/Kconfig"
842 source "arch/arm/plat-stmp3xxx/Kconfig"
845 source "arch/arm/mach-s5pc100/Kconfig"
848 source "arch/arm/mach-u300/Kconfig"
850 source "arch/arm/mach-ux500/Kconfig"
852 source "arch/arm/mach-versatile/Kconfig"
854 source "arch/arm/mach-w90x900/Kconfig"
856 # Definitions to make life easier
862 select GENERIC_CLOCKEVENTS
871 source arch/arm/mm/Kconfig
874 bool "Enable iWMMXt support"
875 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
876 default y if PXA27x || PXA3xx || ARCH_MMP
878 Enable support for iWMMXt context switching at run time if
879 running on a CPU that supports it.
881 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
884 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
888 source "arch/arm/Kconfig-nommu"
891 config ARM_ERRATA_411920
892 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
893 depends on CPU_V6 && !SMP
895 Invalidation of the Instruction Cache operation can
896 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
897 It does not affect the MPCore. This option enables the ARM Ltd.
898 recommended workaround.
900 config ARM_ERRATA_430973
901 bool "ARM errata: Stale prediction on replaced interworking branch"
904 This option enables the workaround for the 430973 Cortex-A8
905 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
906 interworking branch is replaced with another code sequence at the
907 same virtual address, whether due to self-modifying code or virtual
908 to physical address re-mapping, Cortex-A8 does not recover from the
909 stale interworking branch prediction. This results in Cortex-A8
910 executing the new code sequence in the incorrect ARM or Thumb state.
911 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
912 and also flushes the branch target cache at every context switch.
913 Note that setting specific bits in the ACTLR register may not be
914 available in non-secure mode.
916 config ARM_ERRATA_458693
917 bool "ARM errata: Processor deadlock when a false hazard is created"
920 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
921 erratum. For very specific sequences of memory operations, it is
922 possible for a hazard condition intended for a cache line to instead
923 be incorrectly associated with a different cache line. This false
924 hazard might then cause a processor deadlock. The workaround enables
925 the L1 caching of the NEON accesses and disables the PLD instruction
926 in the ACTLR register. Note that setting specific bits in the ACTLR
927 register may not be available in non-secure mode.
929 config ARM_ERRATA_460075
930 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
933 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
934 erratum. Any asynchronous access to the L2 cache may encounter a
935 situation in which recent store transactions to the L2 cache are lost
936 and overwritten with stale memory contents from external memory. The
937 workaround disables the write-allocate mode for the L2 cache via the
938 ACTLR register. Note that setting specific bits in the ACTLR register
939 may not be available in non-secure mode.
943 source "arch/arm/common/Kconfig"
945 config FORCE_MAX_ZONEORDER
958 Find out whether you have ISA slots on your motherboard. ISA is the
959 name of a bus system, i.e. the way the CPU talks to the other stuff
960 inside your box. Other bus systems are PCI, EISA, MicroChannel
961 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
962 newer boards don't support it. If you have ISA, say Y, otherwise N.
964 # Select ISA DMA controller support
969 # Select ISA DMA interface
974 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
976 Find out whether you have a PCI motherboard. PCI is the name of a
977 bus system, i.e. the way the CPU talks to the other stuff inside
978 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
979 VESA. If you have PCI, say Y, otherwise N.
984 # Select the host bridge type
985 config PCI_HOST_VIA82C505
987 depends on PCI && ARCH_SHARK
990 config PCI_HOST_ITE8152
992 depends on PCI && MACH_ARMCORE
996 source "drivers/pci/Kconfig"
998 source "drivers/pcmcia/Kconfig"
1002 menu "Kernel Features"
1004 source "kernel/time/Kconfig"
1007 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1008 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1009 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1010 depends on GENERIC_CLOCKEVENTS
1011 select USE_GENERIC_SMP_HELPERS
1012 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1014 This enables support for systems with more than one CPU. If you have
1015 a system with only one CPU, like most personal computers, say N. If
1016 you have a system with more than one CPU, say Y.
1018 If you say N here, the kernel will run on single and multiprocessor
1019 machines, but will use only one CPU of a multiprocessor machine. If
1020 you say Y here, the kernel will run on many, but not all, single
1021 processor machines. On a single processor machine, the kernel will
1022 run faster if you say N here.
1024 See also <file:Documentation/i386/IO-APIC.txt>,
1025 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1026 <http://www.linuxdoc.org/docs.html#howto>.
1028 If you don't know what to do here, say N.
1034 This option enables support for the ARM system coherency unit
1040 This options enables support for the ARM timer and watchdog unit
1043 prompt "Memory split"
1046 Select the desired split between kernel and user memory.
1048 If you are not absolutely sure what you are doing, leave this
1052 bool "3G/1G user/kernel split"
1054 bool "2G/2G user/kernel split"
1056 bool "1G/3G user/kernel split"
1061 default 0x40000000 if VMSPLIT_1G
1062 default 0x80000000 if VMSPLIT_2G
1066 int "Maximum number of CPUs (2-32)"
1072 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1073 depends on SMP && HOTPLUG && EXPERIMENTAL
1075 Say Y here to experiment with turning CPUs off and on. CPUs
1076 can be controlled through /sys/devices/system/cpu.
1079 bool "Use local timer interrupts"
1080 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1081 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1083 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1085 Enable support for local timers on SMP platforms, rather then the
1086 legacy IPI broadcast method. Local timers allows the system
1087 accounting to be spread across the timer interval, preventing a
1088 "thundering herd" at every timer tick.
1090 source kernel/Kconfig.preempt
1094 default 128 if ARCH_L7200
1095 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440
1096 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1097 default AT91_TIMER_HZ if ARCH_AT91
1100 config THUMB2_KERNEL
1101 bool "Compile the kernel in Thumb-2 mode"
1102 depends on CPU_V7 && EXPERIMENTAL
1104 select ARM_ASM_UNIFIED
1106 By enabling this option, the kernel will be compiled in
1107 Thumb-2 mode. A compiler/assembler that understand the unified
1108 ARM-Thumb syntax is needed.
1112 config ARM_ASM_UNIFIED
1116 bool "Use the ARM EABI to compile the kernel"
1118 This option allows for the kernel to be compiled using the latest
1119 ARM ABI (aka EABI). This is only useful if you are using a user
1120 space environment that is also compiled with EABI.
1122 Since there are major incompatibilities between the legacy ABI and
1123 EABI, especially with regard to structure member alignment, this
1124 option also changes the kernel syscall calling convention to
1125 disambiguate both ABIs and allow for backward compatibility support
1126 (selected with CONFIG_OABI_COMPAT).
1128 To use this you need GCC version 4.0.0 or later.
1131 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1132 depends on AEABI && EXPERIMENTAL
1135 This option preserves the old syscall interface along with the
1136 new (ARM EABI) one. It also provides a compatibility layer to
1137 intercept syscalls that have structure arguments which layout
1138 in memory differs between the legacy ABI and the new ARM EABI
1139 (only for non "thumb" binaries). This option adds a tiny
1140 overhead to all syscalls and produces a slightly larger kernel.
1141 If you know you'll be using only pure EABI user space then you
1142 can say N here. If this option is not selected and you attempt
1143 to execute a legacy ABI binary then the result will be
1144 UNPREDICTABLE (in fact it can be predicted that it won't work
1145 at all). If in doubt say Y.
1147 config ARCH_HAS_HOLES_MEMORYMODEL
1150 # Discontigmem is deprecated
1151 config ARCH_DISCONTIGMEM_ENABLE
1154 config ARCH_SPARSEMEM_ENABLE
1157 config ARCH_SPARSEMEM_DEFAULT
1158 def_bool ARCH_SPARSEMEM_ENABLE
1160 config ARCH_SELECT_MEMORY_MODEL
1161 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1165 default "4" if ARCH_LH7A40X
1167 depends on NEED_MULTIPLE_NODES
1170 bool "High Memory Support (EXPERIMENTAL)"
1171 depends on MMU && EXPERIMENTAL
1173 The address space of ARM processors is only 4 Gigabytes large
1174 and it has to accommodate user address space, kernel address
1175 space as well as some memory mapped IO. That means that, if you
1176 have a large amount of physical memory and/or IO, not all of the
1177 memory can be "permanently mapped" by the kernel. The physical
1178 memory that is not permanently mapped is called "high memory".
1180 Depending on the selected kernel/user memory split, minimum
1181 vmalloc space and actual amount of RAM, you may not need this
1182 option which should result in a slightly faster kernel.
1187 bool "Allocate 2nd-level pagetables from highmem"
1189 depends on !OUTER_CACHE
1194 bool "Timer and CPU usage LEDs"
1195 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1196 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1197 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1198 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1199 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1200 ARCH_AT91 || ARCH_DAVINCI || \
1201 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1203 If you say Y here, the LEDs on your machine will be used
1204 to provide useful information about your current system status.
1206 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1207 be able to select which LEDs are active using the options below. If
1208 you are compiling a kernel for the EBSA-110 or the LART however, the
1209 red LED will simply flash regularly to indicate that the system is
1210 still functional. It is safe to say Y here if you have a CATS
1211 system, but the driver will do nothing.
1214 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1215 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1216 || MACH_OMAP_PERSEUS2
1218 depends on !GENERIC_CLOCKEVENTS
1219 default y if ARCH_EBSA110
1221 If you say Y here, one of the system LEDs (the green one on the
1222 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1223 will flash regularly to indicate that the system is still
1224 operational. This is mainly useful to kernel hackers who are
1225 debugging unstable kernels.
1227 The LART uses the same LED for both Timer LED and CPU usage LED
1228 functions. You may choose to use both, but the Timer LED function
1229 will overrule the CPU usage LED.
1232 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1234 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1235 || MACH_OMAP_PERSEUS2
1238 If you say Y here, the red LED will be used to give a good real
1239 time indication of CPU usage, by lighting whenever the idle task
1240 is not currently executing.
1242 The LART uses the same LED for both Timer LED and CPU usage LED
1243 functions. You may choose to use both, but the Timer LED function
1244 will overrule the CPU usage LED.
1246 config ALIGNMENT_TRAP
1248 depends on CPU_CP15_MMU
1249 default y if !ARCH_EBSA110
1251 ARM processors cannot fetch/store information which is not
1252 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1253 address divisible by 4. On 32-bit ARM processors, these non-aligned
1254 fetch/store instructions will be emulated in software if you say
1255 here, which has a severe performance impact. This is necessary for
1256 correct operation of some network protocols. With an IP-only
1257 configuration it is safe to say N, otherwise say Y.
1259 config UACCESS_WITH_MEMCPY
1260 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1261 depends on MMU && EXPERIMENTAL
1262 default y if CPU_FEROCEON
1264 Implement faster copy_to_user and clear_user methods for CPU
1265 cores where a 8-word STM instruction give significantly higher
1266 memory write throughput than a sequence of individual 32bit stores.
1268 A possible side effect is a slight increase in scheduling latency
1269 between threads sharing the same address space if they invoke
1270 such copy operations with large buffers.
1272 However, if the CPU data cache is using a write-allocate mode,
1273 this option is unlikely to provide any performance gain.
1279 # Compressed boot loader in ROM. Yes, we really want to ask about
1280 # TEXT and BSS so we preserve their values in the config files.
1281 config ZBOOT_ROM_TEXT
1282 hex "Compressed ROM boot loader base address"
1285 The physical address at which the ROM-able zImage is to be
1286 placed in the target. Platforms which normally make use of
1287 ROM-able zImage formats normally set this to a suitable
1288 value in their defconfig file.
1290 If ZBOOT_ROM is not enabled, this has no effect.
1292 config ZBOOT_ROM_BSS
1293 hex "Compressed ROM boot loader BSS address"
1296 The base address of an area of read/write memory in the target
1297 for the ROM-able zImage which must be available while the
1298 decompressor is running. It must be large enough to hold the
1299 entire decompressed kernel plus an additional 128 KiB.
1300 Platforms which normally make use of ROM-able zImage formats
1301 normally set this to a suitable value in their defconfig file.
1303 If ZBOOT_ROM is not enabled, this has no effect.
1306 bool "Compressed boot loader in ROM/flash"
1307 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1309 Say Y here if you intend to execute your compressed kernel image
1310 (zImage) directly from ROM or flash. If unsure, say N.
1313 string "Default kernel command string"
1316 On some architectures (EBSA110 and CATS), there is currently no way
1317 for the boot loader to pass arguments to the kernel. For these
1318 architectures, you should supply some command-line options at build
1319 time by entering them here. As a minimum, you should specify the
1320 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1323 bool "Kernel Execute-In-Place from ROM"
1324 depends on !ZBOOT_ROM
1326 Execute-In-Place allows the kernel to run from non-volatile storage
1327 directly addressable by the CPU, such as NOR flash. This saves RAM
1328 space since the text section of the kernel is not loaded from flash
1329 to RAM. Read-write sections, such as the data section and stack,
1330 are still copied to RAM. The XIP kernel is not compressed since
1331 it has to run directly from flash, so it will take more space to
1332 store it. The flash address used to link the kernel object files,
1333 and for storing it, is configuration dependent. Therefore, if you
1334 say Y here, you must know the proper physical address where to
1335 store the kernel image depending on your own flash memory usage.
1337 Also note that the make target becomes "make xipImage" rather than
1338 "make zImage" or "make Image". The final kernel binary to put in
1339 ROM memory will be arch/arm/boot/xipImage.
1343 config XIP_PHYS_ADDR
1344 hex "XIP Kernel Physical Location"
1345 depends on XIP_KERNEL
1346 default "0x00080000"
1348 This is the physical address in your flash memory the kernel will
1349 be linked for and stored to. This address is dependent on your
1353 bool "Kexec system call (EXPERIMENTAL)"
1354 depends on EXPERIMENTAL
1356 kexec is a system call that implements the ability to shutdown your
1357 current kernel, and to start another kernel. It is like a reboot
1358 but it is independent of the system firmware. And like a reboot
1359 you can start any kernel with it, not just Linux.
1361 It is an ongoing process to be certain the hardware in a machine
1362 is properly shutdown, so do not be surprised if this code does not
1363 initially work for you. It may help to enable device hotplugging
1367 bool "Export atags in procfs"
1371 Should the atags used to boot the kernel be exported in an "atags"
1372 file in procfs. Useful with kexec.
1376 menu "CPU Power Management"
1380 source "drivers/cpufreq/Kconfig"
1382 config CPU_FREQ_SA1100
1385 config CPU_FREQ_SA1110
1388 config CPU_FREQ_INTEGRATOR
1389 tristate "CPUfreq driver for ARM Integrator CPUs"
1390 depends on ARCH_INTEGRATOR && CPU_FREQ
1393 This enables the CPUfreq driver for ARM Integrator CPUs.
1395 For details, take a look at <file:Documentation/cpu-freq>.
1401 depends on CPU_FREQ && ARCH_PXA && PXA25x
1403 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1405 config CPU_FREQ_S3C64XX
1406 bool "CPUfreq support for Samsung S3C64XX CPUs"
1407 depends on CPU_FREQ && CPU_S3C6410
1412 Internal configuration node for common cpufreq on Samsung SoC
1414 config CPU_FREQ_S3C24XX
1415 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1416 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1419 This enables the CPUfreq driver for the Samsung S3C24XX family
1422 For details, take a look at <file:Documentation/cpu-freq>.
1426 config CPU_FREQ_S3C24XX_PLL
1427 bool "Support CPUfreq changing of PLL frequency"
1428 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1430 Compile in support for changing the PLL frequency from the
1431 S3C24XX series CPUfreq driver. The PLL takes time to settle
1432 after a frequency change, so by default it is not enabled.
1434 This also means that the PLL tables for the selected CPU(s) will
1435 be built which may increase the size of the kernel image.
1437 config CPU_FREQ_S3C24XX_DEBUG
1438 bool "Debug CPUfreq Samsung driver core"
1439 depends on CPU_FREQ_S3C24XX
1441 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1443 config CPU_FREQ_S3C24XX_IODEBUG
1444 bool "Debug CPUfreq Samsung driver IO timing"
1445 depends on CPU_FREQ_S3C24XX
1447 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1449 config CPU_FREQ_S3C24XX_DEBUGFS
1450 bool "Export debugfs for CPUFreq"
1451 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1453 Export status information via debugfs.
1457 source "drivers/cpuidle/Kconfig"
1461 menu "Floating point emulation"
1463 comment "At least one emulation must be selected"
1466 bool "NWFPE math emulation"
1467 depends on !AEABI || OABI_COMPAT
1469 Say Y to include the NWFPE floating point emulator in the kernel.
1470 This is necessary to run most binaries. Linux does not currently
1471 support floating point hardware so you need to say Y here even if
1472 your machine has an FPA or floating point co-processor podule.
1474 You may say N here if you are going to load the Acorn FPEmulator
1475 early in the bootup.
1478 bool "Support extended precision"
1479 depends on FPE_NWFPE
1481 Say Y to include 80-bit support in the kernel floating-point
1482 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1483 Note that gcc does not generate 80-bit operations by default,
1484 so in most cases this option only enlarges the size of the
1485 floating point emulator without any good reason.
1487 You almost surely want to say N here.
1490 bool "FastFPE math emulation (EXPERIMENTAL)"
1491 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1493 Say Y here to include the FAST floating point emulator in the kernel.
1494 This is an experimental much faster emulator which now also has full
1495 precision for the mantissa. It does not support any exceptions.
1496 It is very simple, and approximately 3-6 times faster than NWFPE.
1498 It should be sufficient for most programs. It may be not suitable
1499 for scientific calculations, but you have to check this for yourself.
1500 If you do not feel you need a faster FP emulation you should better
1504 bool "VFP-format floating point maths"
1505 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1507 Say Y to include VFP support code in the kernel. This is needed
1508 if your hardware includes a VFP unit.
1510 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1511 release notes and additional status information.
1513 Say N if your target does not have VFP hardware.
1521 bool "Advanced SIMD (NEON) Extension support"
1522 depends on VFPv3 && CPU_V7
1524 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1529 menu "Userspace binary formats"
1531 source "fs/Kconfig.binfmt"
1534 tristate "RISC OS personality"
1537 Say Y here to include the kernel code necessary if you want to run
1538 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1539 experimental; if this sounds frightening, say N and sleep in peace.
1540 You can also say M here to compile this support as a module (which
1541 will be called arthur).
1545 menu "Power management options"
1547 source "kernel/power/Kconfig"
1549 config ARCH_SUSPEND_POSSIBLE
1554 source "net/Kconfig"
1556 source "drivers/Kconfig"
1560 source "arch/arm/Kconfig.debug"
1562 source "security/Kconfig"
1564 source "crypto/Kconfig"
1566 source "lib/Kconfig"